Home / 20,642.20-28,421.49-18,217.06

Finding the Fourth Proportional to 20,642.20, 28,421.49 and 18,217.06

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Solution

The fourth proportional to 20,642.20, 28,421.49 and 18,217.06 is: 25,082.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,642.20 : 28,421.49 = 18,217.06 : x
  2. Step 2: Convert to fraction form
    20,642.20/28,421.49 = 18,217.06/x
  3. Step 3: Cross multiply
    20,642.20x = 28,421.49 × 18,217.06
  4. Step 4: Simplify right side
    20,642.20x = 517,755,988.62
  5. Step 5: Solve for x
    x = 517,755,988.62/20,642.20
  6. Step 6: Final answer
    x = 25,082.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.